Objective To investigate the effects of luting agent on the final color of glass infiltrated alumina ce-ramic restorations. Methods 12 plate-shaped specimens
with 12.5 mm in diameter and 0.5 mm thickness were fabri-cated from GI－II（color IG2）. Vitadur alpha veneering porcelain（color A2） with 1.0 mm thickness was fired to GI－Ⅱ glass/alumina composite. 12 plate-shaped background specimens simulating the metal alloy post-and-core 12.5 mm in diameter and 2 mm thickness were also made from Ni-Cr alloy. All-ceramic specimens were luted to the metal alloy by Zinc Phosphate cement, glass ionomer cement and composite resin. The color shifts of the specimens were measured by colorimeter. Results Luting agents had effect on the final color of restorations. The influence of composite resin was least, followed by glass ionomer cement and Zinc Phosphate cement. The color difference between with and without Zinc Phosphate cement could be identified by the eye. Conclusion To reduce the effect of luting agents, composite resin is recommended to all-ceramic restorations′ adhesion.
